it all depends on the heath of the plants root system.
i would also say it depends on your lighting and feeding programme to .
but hey I'm just a Nobe and dont know much but what I'm finding out here and on my own. i would say if it is growing as fast as mine is then i would give it a month and re pot it in a 5 gallon bucket. then leave it alone till you go to cutting it up and smoking it . the least amount of stress the better your plant will repay you.